Craig Electronics CMA3224 3-In-1 Audio Combo Pack - Headphones, Earbuds and Twin Speakers Headphones: Driver Unit - 40mm diameter magnet and 32 ohms impedance Earbuds: Driver Unite 10mm Diameter Magnet and Impedance 16 ohms Twin Speakers: Aux In Stereo Round Speakers -plays all audio devices through 3.5mm aux in jack